On average, banks require their customers to maintain an average monthly balance of S$500 to S$5,000, with charges between S$2.50 to S$10* monthly for failing to maintain the minimum deposit. This means that the interest you earn is lost through charges. With Plus! Savings Account, you have the flexibility to use your money and earn high interest. The Plus! Savings account do not charge any fall below feel charges. No upfront or minimum monthly balance is also required. * Based on survey of banks in Singapore as of 21 February 2007.